This hasn't gotten political yet, (that I know of), but it's in the media and you know it won't be very long until the full blown hysteria takes over.
We know that an all plastic gun isn't going to function beyond injuring bystanders, if it functions at all, but the anti gun crowd will believe that we're on the verge of a flood of unregistered weapons as easily obtainable as printing a page of text.

Quote:"Welcome to the dark side of 3D printing.

The hobby is best known
for creating colorful toys and trinkets, but some enthusiasts are
working on design files that would allow anyone to print a working gun.
These don't exist yet, but some believe it's only a matter of time."

"The problems with 3D-printed firearms aren't limited to catastrophic failure. (It takes only one bullet to kill.) There is also the issue of legality. No federal laws address manufacturing weapons with 3D printers, so anyone owning a printer could make a weapon -- even if they're not allowed to own one. The ATF considers the rifle's lower receiver as the firearm; anyone can purchase the upper receiver, barrel, etc.

The 1988 Undetectable Firearms Act prohibits the manufacturing or possession of guns that can't be picked up by airport metal detectors. This creates a loophole for hobbyists. Firearms typically require metal parts (barrel, springs, bolt, etc.) to function, and those parts can be detected. However, some companies don't want to take any chances. Defense Distributed's first attempt at funding in September through Indiegogo ended in disaster; Indiegogo froze DD's account and sent the $20,000 it raised back to the backers. In October, Stratasys terminated the group's 3D printer lease and seized the equipment from a member's home."